Overview
The ADM8691ARN-REEL, produced by Analog Devices Inc., is a supervisory circuit designed for microprocessor systems. It is part of the ADM8690/ADM8691/ADM8695 family, which offers a range of functions including power-on reset, battery backup switching, and watchdog timer capabilities. This component is fabricated using an advanced epitaxial CMOS process, ensuring low power consumption and high reliability. Although the ADM8691ARN-REEL is currently obsolete and no longer manufactured, it remains relevant for understanding and maintaining existing systems that incorporate this component.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Nominal Reset Time | 50 ms or Adjustable | Dependent on configuration |
| Nominal VCC Reset Threshold | 4.65 V | Guaranteed minimum and maximum thresholds are 4.5 V and 4.73 V |
| Nominal Watchdog Timeout Period | 100 ms, 1.6 sec, or Adjustable | Configurable using external components |
| Battery Backup Switching | Yes | Automatic battery backup power switching |
| Low Power Consumption | 0.7 mW | Standby current: 400 nA |
| High Current Drive | Up to 100 mA | No external pass transistor required |
| Switch On Resistance | 0.7 Ω (normal), 7 Ω (backup) | |
| Package Type | 16-lead PDIP, SOIC |
Key Features
- Power-on Reset Output: Provides reset output during power-up, power-down, and brownout conditions, operational with VCC as low as 1 V.
- Battery Backup Switching: Automatic battery backup power switching for CMOS RAM, CMOS microprocessors, or other low power logic.
- Watchdog Timer: Reset pulse if the optional watchdog timer is not toggled within a specified time, with adjustable timeout periods.
- Low Power Consumption: 0.7 mW power consumption with a standby current of 400 nA.
- High Current Drive: Up to 100 mA output current drive without the need for an external pass transistor.
- Fast Chip Enable Gating: Extremely fast gating of chip enable signals (3 ns).
- Voltage Monitor: 1.3 V threshold detector for power-fail warning, low battery detection, or to monitor a power supply other than 5 V).
Applications
- Microprocessor Systems: Ensures stable operation and reset functions in microprocessor-based systems.
- Computers and Controllers: Suitable for use in computer systems and control units requiring robust power management).
- Intelligent Instruments: Used in intelligent instruments that require precise power monitoring and backup capabilities).
- Automotive Systems: Applicable in automotive systems where reliable power management is critical).
Q & A
- What is the primary function of the ADM8691ARN-REEL?
The primary function is to provide supervisory functions including power-on reset, battery backup switching, and watchdog timer capabilities for microprocessor systems).
- What is the nominal VCC reset threshold for the ADM8691ARN-REEL?
The nominal VCC reset threshold is 4.65 V, with guaranteed minimum and maximum thresholds of 4.5 V and 4.73 V).
- Can the ADM8691ARN-REEL drive high currents?
Yes, it can drive up to 100 mA without the need for an external pass transistor).
- What is the power consumption of the ADM8691ARN-REEL?
The power consumption is 0.7 mW, with a standby current of 400 nA).
- Is the ADM8691ARN-REEL still in production?
No, the ADM8691ARN-REEL is currently obsolete and no longer manufactured).
- What package types are available for the ADM8691ARN-REEL?
It is available in 16-lead PDIP and SOIC packages).
- What is the purpose of the watchdog timer in the ADM8691ARN-REEL?
The watchdog timer ensures that the system resets if the timer is not toggled within a specified time, preventing system hang-ups).
- How fast is the chip enable gating in the ADM8691ARN-REEL?
The chip enable gating is extremely fast, with a response time of 3 ns).
- What is the voltage monitor function in the ADM8691ARN-REEL?
The voltage monitor includes a 1.3 V threshold detector for power-fail warning, low battery detection, or monitoring other power supplies).
- What are some common applications of the ADM8691ARN-REEL?
Common applications include microprocessor systems, computers, controllers, intelligent instruments, and automotive systems).
